The Korean won has climbed the most against the US dollar among Asian currencies since July as quantitative easing by Europe, the US and Japan added to global liquidity, some of which flowed into Asian emerging markets.

The Korean won has gained 4.3 per cent against the greenback since July 2 when European Central Bank president Mario Draghi hinted at a nontraditional monetary policy, marking the steepest appreciation among Asian currencies, according to data from the Bank of Korea.

The domestic currency closed at 1,097 won per dollar as of Friday after breaching the 1,100 won level in the previous session for the first time since Sept 9, 2011.

The Chinese yuan also gained against the greenback to end at 6.2417 yuan per dollar on Friday, the lowest-ever yuan-dollar exchange rate. The Hong Kong dollar strengthened against the US dollar to 7.7501 Hong Kong dollars per US dollar, the lowest exchange rate in 34 months since Dec 7, 2009. The Singaporean dollar hit 1.2168 per US dollar on October 18, marking the lowest exchange rate in 13 months since September 9 last year.

Asian currencies began to strengthen in July, and more sharply since the quantitative easing measures in September.

That month, the ECB announced an unlimited government debt-purchasing plan, and the US Federal Reserve vowed to inject $40 billion each month to purchase mortgage-backed securities to revitalise the economy.

Korea’s key interest rate currently stands at 2.75 per cent, while the US and the eurozone hold comparable rates of 0.25 per cent and 0.75 per cent, respectively.

The Korean won is likely to remain strong against the greenback for the time being as Seoul is reluctant to intervene in the foreign exchange market and holds abundant foreign reserves, according to market watchers.

“Even if the foreign exchange authorities intervene, they would merely control the speed (of appreciation) and won’t be able to rein in the (appreciation) trend,” said Park Yu-na, a researcher at Dongbu Securities.

“There can be an adjustment, but the local currency is expected to reach the 1,080-won-per-dollar level by the end of this year.”

Korea’s foreign reserves rose to a fresh high in September by reaching $322.01 billion, up $51.3 billion from the previous month, according to the central bank.

Other currencies such as the Malaysian ringgit (4.1 per cent), Singaporean dollar (3.6 per cent), Swedish krona (3 per cent), Thai baht (2.8 per cent), Canadian dollar (2.2 per cent), Chinese yuan (1.8 per cent), Danish krona (1.8 per cent), Hong Kong dollar (0.1 per cent) and Saudi Arabian riyal (0.01 per cent) have also risen against the US dollar since July 2.